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| Reign | Name | (born – died) | Notes |
| 27 BC – 14 AD | Augustus | (c. 63 BC – 14 AD) | Julio-Claudian |
| 14 – 37 | Tiberius | (c. 42 BC – 37 AD) | Julio-Claudian |
| 37 – 41 | Gaius (Caligula) | (c. 12 – 41) | Julio-Claudian |
| 41 – 54 | Claudius | (c. 10 BC – 54 AD) | Julio-Claudian |
| 54 – 68 | Nero | (c. 37 – 68) | Julio-Claudian |
| 68 – 69 | Galba | (3 BC – 69 AD) | Year of the 4 Emperors |
| 69 | Otho | (c. 32 – 69) | Year of the 4 Emperors |
| 69 | Vitellius | (c. 15 – 69) | Year of the 4 Emperors |
| 69 – 79 | Vespasian | (c. 9 – 79) | Year of the 4 Emperors / Flavian |
| 79 – 81 | Titus | (c. 39 – 79) | Flavian |
| 81 – 96 | Domitian | (c. 51 – 96) | Flavian |
| 96 – 98 | Nerva | (c.30 – 98) | Adoptive (5 Good Emperors) |
| 98 – 117 | Trajan | (c. 53 – 117) | Adoptive (5 Good Emperors) |
| 117 – 138 | Hadrian | (c. 76 – 138) | Adoptive (5 Good Emperors) |
| 138 – 161 | Antoninus Pius | (c. 86 – 161) | Adoptive / Antonine (5 Good Emperors) |
| 161 – 180 | Marcus Aurelius | (c. 121 – 180) | Adoptive / Antonine (5 Good Emperors) |
| 161 – 169 | Lucius Verus | (c. 130 – 169) | Adoptive / Antonine (co-emperor) D20 |
| 180 – 192 | Commodus | (c. 161 – 192) | Adoptive / Antonine |
| 193 | Pertinax | (c. 126 – 193) | |
| 193 | Didius Julianus | (c. 133 – 193) | |
| 193 – 211 | Septimius Severus | (c. 145 – 211) | Severan |
| 193 – 195 | Pescennius Niger | (c. [135 – 140?] – 195) | Emperor in Syria |
| 195 – 197 | Clodius Albinus | (c. [140 -150?] – 197) | Emperor in Britain |
| 211 – 217 | Caracalla | (c. 188 – 217) | Severan |
| 211 | Geta | (c. 189 – 211) | Severan |
| 217 – 218 | Macrinus | (c. 165 – 218) | |
| 218 – 222 | Elagabalus | (c. 204 -222) | Severan |
| 222 – 235 | Severus Alexander | (c. 208 – 235) | Severan |
| 235 – 238 | Maximus I | (c. 173? – 238) | also called Maximus Thrax |
| 238 | Gordian I | (c. 159 – 238) | |
| 238 | Gordian II | (c. 192 – 238) | |
| 238 | Balbinus | (c.170? – 238) | |
| 238 | Pupienus | (c. 175? – 238) | |
| 238 – 244 | Gordian III | (c. 225 – 244) | |
| 244 – 249 | Philip I | (c. 204 – 249) | (the Arab) |
| 249 – 251 | Trajanus Decius | (c. 190 – 251) | |
| 251 – 253 | Trebonianus Gallus | (c. 206 – 253) | |
| 253 | Aemilian | (c. 207? – 253) | |
| 253 – 260 | Valerian | (c. 200? – 260) | |
| 253 – 268 | Gallienus | (c. 218 – 268) | |
| Gallic Empire | |||
| 260 – 268 | Postumus | (c. ? – 268) | Gallic Emperor |
| 269 | Laelianus | (c. ? – 269) | Gallic Emperor |
| 269 | Marius | (c. ? – 269) | Gallic Emperor |
| 269 – 271 | Victorinus | (c. ? – 271) | Gallic Emperor |
| 271 – 274 | Tetricus | (c. ? – 274) | Gallic Emperor |
| End of Gallic Empire | |||
| 268 – 270 | Claudius II Gothicus | (c. 214 – 270) | |
| 270 | Quintillus | (c. ? – 270) | |
| 270 – 275 | Aurelian | (c. 214 – 275) | |
| 275 – 276 | Tacitus | (c. ? – 276) | |
| 276 | Florianus | (c.? – 276) | |
| 276 – 282 | Probus | (c. 232 – 282) | |
| 282 – 283 | Carus | (c. 230? – 283) | |
| 283 – 285 | Carinus | (c. ? – 285) | co-emperor with Numerianus |
| 283 – 284 | Numerianus | (c. ? – 284) | co-emperor with Carinus |
| 284 – 305 | Diocletian | (c. 240? – 305) | co-emperor with Maximian / House of Constantine |
| 286 – 305 | Maximianus | (c. ? – 308) | co-emperor with Diocletian / House of Constantine |
| 307 – 308 | Maximianus | (c. ? – 308) | House of Constantine |
| Britannic Empire | |||
| 286 – 293 | Carausius | (c. ? – 293) | Emperor in Britannia |
| 293 – 297 | Allectus | (c. ? – 297) | Emperor in Britannia |
| End of Britannic Empire | |||
| 305 – 306 | Constantius I Chlorus | (c. 250? – 306) | House of Constantine |
| 305 – 311 | Galerius | (c. 250? -311) | House of Constantine |
| 306 – 307 | Severus II | (c. ? – 307) | co-emperor with Galerius |
| 306 – 312 | Maxentius | (c. 279 – 312) | House of Constantine |
| 306 – 337 | Constantine I The Great | (c. 285 – 337) | House of Constantine |
| 308 – 324 | Licinius | (c. 250 – 325) | |
| 337 – 340 | Constantine II | (c. 317 – 340) | House of Constantine |
| 337 – 361 | Constantius II | (c. 321 – 361) | House of Constantine |
| 337 – 350 | Constans I | (c. 323 – 350) | House of Constantine |
| 350 – 353 | Magnentius | (c. 303 – 353) | |
| 361 – 363 | Julian I the Apostate | (c. 332 – 363) | House of Constantine |
| 363 – 364 | Jovian | (c. 330 – 364) | |
| Split of the Empire – Western Empire | |||
| 364 – 375 | Valentinian I | (c. 321 – 375) | House of Valentinian, emperor in the west |
| 367 – 383 | Gratian | (c. 359 – 383) | House of Valentinian, emperor in the west |
| 375 – 392 | Valentinian II | (c. 371 – 392) | House of Valentinian, emperor in the west |
| 379 – 395 | Theodosius I The Great | (c. 347 – 395) | Theodosian Dynasty / joint emperor in the west, emperor in the east |
| 383 – 388 | Magnus Maximus | (c. 335 – 388) | Rival in the west |
| 392 – 394 | Eugenius | (c. ? – 394) | Usurper in the west |
| 395 – 423 | Honorius | (c. 384 – 423) | Theodosian Dynasty |
| 423 – 425 | Johannes | (c. ? – 425) | |
| 425 – 455 | Valentinian III | (c. 419 – 455) | Theodosian Dynasty |
| 455 | Petronius Maximus | (c. 396 – 455) | |
| 455 – 456 | Avitus | (c. 395 – 456) | |
| 457 – 461 | Majorian | (c. ? – 461) | |
| 461 – 465 | Libius Severus | (c. 461 – 465) | |
| 467 – 472 | Anthemius | (c. 420 – 472) | |
| 472 | Olybrius | (c. ? – 472) | |
| 473 – 474 | Glycerius | (c. ? – 474) | |
| 474 – 475 | Julius Nepos | (c. ? – 480) | Emperor in the West until 475 |
| 475 – 476 | Romulus Augustulus | (c. ? – ?) | |
| 477 – 480 | Julius Nepos | (c. ? – 480) | Emperor in Dalmatia 477 – 480 |
| Split of the Empire – Eastern Empire | |||
| 364 – 378 | Valens | (c. 328 – 378) | House of Valentinian, emperor in the east |
| 365 – 366 | Procopius | (c. ? – 366) | usurper to Valens |
| 379 – 395 | Theodosius I The Great | (c. 347 – 395) | Theodosian Dynasty / joint emperor in the west, emperor in the east |
| 395 – 408 | Arcadius | (c. 377 – 408) | Theodosian Dynasty |
| 408 – 450 | Theodosius II | (c. 401 – 450) | Theodosian Dynasty |
| 450 – 457 | Marcian | (c. 392 – 457) | Theodosian Dynasty |
| 457 – 474 | Leo I The Great | (c. 401 – 474) | |
| 474 | Leo II | (c. 467 – 474) | |
| 474 – 475 | Zeno | (c. ? – 491) | |
| 475 – 476 | Basiliscus | (c. ? – 476) | Rival to Zeno |
| 476 – 491 | Zeno | (c. ? – 491) | |
| 491 – 518 | Anastasius | (c. 430 – 518) | |
Created 26 Feb 2009